[Java daily question] 20170104, java20170104

Source: Internet
Author: User

[Java daily question] 20170104, java20170104

20170103 for problem resolution, click "Java daily question" 20170104 "below today's question to view the problem (The problem is resolved at the beginning of the public account, public ID: weknow619)

Package Jan2017; import java. util. hashSet; import java. util. set; public class Ques0104 {public static void main (String [] args) {Obj obj01 = new Obj ("Zhang San"); Obj obj02 = new Obj ("Li Si "); obj obj03 = new Obj ("Li Si"); Set <Obj> set = new HashSet <Obj> (); set. add (obj01); set. add (obj02); set. add (obj03); System. out. println (set. size () ;}} class Obj {private String id; public Obj (String id) {this. id = id ;}@ Override public int hashCode () {return 123 ;}@ Override public boolean equals (Object obj) {if (this = obj) {return true ;} if (obj instanceof Obj & this. id. equals (Obj) obj ). id) {return true;} return false ;}}

Today's question:
What is the output result of the main program? (Click "[Java daily question] 20170104" below to view issue resolution 20170103)

Questions originally published on the public account and short book: [Java daily question] 20170104, [Java daily question] 20170104 (you can also scan the Avatar QR code to view)

The weknow team has activated the authentication and has answered questions. If you have any questions, you can also consult. Click the answer to find me !!


Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.